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// SPDX-License-Identifier: GPL-2.0
/*
* I'm tired of doing "vsnprintf()" etc just to open a
* file, so here's a "return static buffer with printf"
* interface for paths.
*
* It's obviously not thread-safe. Sue me. But it's quite
* useful for doing things like
*
* f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
*
* which is what it's designed for.
*/
#include "path.h"
#include "cache.h"
#include <linux/kernel.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
static char bad_path[] = "/bad-path/";
/*
* One hack:
*/
static char *get_pathname(void)
{
static char pathname_array[4][PATH_MAX];
static int idx;
return pathname_array[3 & ++idx];
}
static char *cleanup_path(char *path)
{
/* Clean it up */
if (!memcmp(path, "./", 2)) {
path += 2;
while (*path == '/')
path++;
}
return path;
}
char *mkpath(const char *fmt, ...)
{
va_list args;
unsigned len;
char *pathname = get_pathname();
va_start(args, fmt);
len = vsnprintf(pathname, PATH_MAX, fmt, args);
va_end(args);
if (len >= PATH_MAX)
return bad_path;
return cleanup_path(pathname);
}
int path__join(char *bf, size_t size, const char *path1, const char *path2)
{
return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
}
int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
{
return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
path2, path2[0] ? "/" : "", path3);
}
bool is_regular_file(const char *file)
{
struct stat st;
if (stat(file, &st))
return false;
return S_ISREG(st.st_mode);
}
/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
bool is_directory(const char *base_path, const struct dirent *dent)
{
char path[PATH_MAX];
struct stat st;
snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return false;
return S_ISDIR(st.st_mode);
}
bool is_executable_file(const char *base_path, const struct dirent *dent)
{
char path[PATH_MAX];
struct stat st;
snprintf(path, sizeof(path), "%s/%s", base_path, dent->d_name);
if (stat(path, &st))
return false;
return !S_ISDIR(st.st_mode) && (st.st_mode & S_IXUSR);
}
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